The ornamental design for a merchandisedisplayrack, as shown and described.
FIG. 1 is a front, perspective view of a merchandise display rack showing our new design;
FIG. 2 is a bottom, perspective view thereof;
FIG. 3 is a front view thereof, the rear view being a mirror image of the front view;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The features shown in broken lines depict environmental subject matter only and form no part of the claimed design. The unshaded bottom surface depicted in FIGS. 2 and 7, which is bounded by broken lines illustrated in the figures, also is not part of the claimed design.